Mouthguard benefits?

Do any of you guys use mouthguard for both the upper and lower. One of the guys in class has one because he has braces and saw that there's a small hole in the center. Just wondering how hard it is to breath with those things.
 
Alright thanks virtuoso and also am i suppose to look like I have a raging boner when I wear one

Ha ha ha, I look like I have a raging boner while wearing one, but anyone with a brain will know that it's a cup. You should walk around like your proud of it though, so that anyone that doesn't know it's a cup, will be impressed. Ha ha ha!
 
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